I hope you all will be absolutely fine and having fun. L is an Integrated Circuit IC available in two type of packages now a days which will be given later. L is a dual full bridge driver that has a capability to bear high voltage as well as high current. It receives basic TTL Transistor Transistor Logic logic levels and is able to operate the different loads such as DC motors, stepper motors, relays etc. You should also have a look at Introduction to L23D. L has two enable input to control any device by enabling or disabling it.
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Click the image to enlarge Introduction This Stepper motor controller uses the L and LN driver combination; it can be used as stand alone or controlled by microcontroller. It is designed to accept step pulses at up to 25, per second. An on-board step pulse generator can be used if desired pps range. The output driver is capable of driving up to 2Amp into each phase of a two-phase bipolar step motor. The motor winding current is limited by means of a 35KHZ-chopper scheme.
The potentiometer R6 is for varying the winding currents. The nature of the chopping scheme eliminates the need for external current limiting resistors on the motor windings; this simplifies connections and increases efficiency.
A useful of this design is the "idle" current reduction mode. Similarly, the motor current can be commanded to shut entirely off. The motor supply voltages should be at least 9V, but must never exceed 32V. J3 Pin Functions Step pulse J Increments the motor step counts in the selected direction by one step or haft step.
The increment is triggered on the negative edge of the input pulse. When left disconnected or driven high, the half step mode is selected. When brought low, this line select the full step or wavedrive modes. Home output J A high on this pin indicates the controller is in the "Home" state Step Pulse Specification The minimum Step pulse width is 1usec, and can remain low indefinitely if needed. It must be high for at least 1usec between pulses, and may not repeat more than 25, times per second.
It is not recommended to run the stepping motions at this low current. Further it is advisable to allow the stepper motor to remain at full current for at least 0. The reason for this is that the mechanical system attached to the motor will have some amount of inertia, If the current is reduced too soon, the motor may overrun the position it was commanded to go.
FullStep Mode The fullstep mode sequences the motor phase in the following manner: A.
Stepper Motor driver circuit with L297 L298
L297 pour la commande de moteur pas à pas